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J Endod. 2018 Nov;44(11):1671-1676. doi: 10.1016/j.joen.2018.08.005.

Apical Papilla Cells Are Capable of Forming a Pulplike Tissue with Odontoblastlike Cells without the Use of Exogenous Growth Factors.

Author information

1
Laboratory of Stem Cell Biology in Dentistry-LABITRON, Oral and Maxillofacial Pathology Department, School of Dentistry, University of São Paulo, São Paulo, São Paulo, Brazil.
2
Laboratory of Stem Cell Biology in Dentistry-LABITRON, Oral and Maxillofacial Pathology Department, School of Dentistry, University of São Paulo, São Paulo, São Paulo, Brazil. Electronic address: trierveiler@usp.br.

Abstract

INTRODUCTION:

Dental pulp is a complex tissue with highly differentiated cells, which makes its reconstruction a challenging task. The apical papilla is an undifferentiated tissue considered as the remnant of the dental papilla that forms the dentin-pulp complex. Aiming to analyze morphologic features of the tissue formed in an in vivo pulp model, we used human apical papilla as a cell source without the use of exogenous growth factors.

METHODS:

A construct was built using newborn mice molar crowns treated with TrypLE (Fisher Scientific, Loughborough, UK) and EDTA. The crowns were filled with PuraMatrix (Corning Inc, Corning, NY) and a pool population of human apical papilla cells. As a control, we used crowns filled only with PuraMatrix and empty crowns. The constructs were transplanted under severe combined immunodeficient mice kidney capsules. Immunohistochemistry for lamin A, dentin sialophosphoprotein, and dentin matrix protein 1 was performed.

RESULTS:

Morphologic analysis of all transplanted crowns showed the formation of a loose connective tissue of variable cellularity with the presence of well-formed functional vessels. In the study group, lamin A-positive cells represented the majority of cells within the pulp chamber and a few cells in the vessel lining. We also found positivity for dentin sialophosphoprotein and dentin matrix protein 1, an indicator of odontoblast differentiation.

CONCLUSIONS:

In our study model, human transplanted apical papilla cells mixed with the host cells and formed a vascularized viable tissue, and these cells were able to differentiate into odontoblastlike cells without the use of exogenous growth factors.

KEYWORDS:

Apical papilla; dentin sialophosphoprotein; growth factors; odontoblast; pulp regeneration

PMID:
30409448
DOI:
10.1016/j.joen.2018.08.005

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